Sash-suspension device.



M. DOBSON.

SASH SUSPENSION DEVICE.

APPLIOATION FILED DEC. 30, 1910.

Patented June 13, 1911.

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M. DOBSON.

SASH SUSPENSION DEVICE. APPLIOATION rruzn 10110.30, 1910.

Patented June 13,1911.

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SATES PATENT Fro MATTHEW DOBSON, OF PITTSBURG, PENNSYLVANIA.

SASH-SUSPENSION DEVICE.

Specification of Letters Patent. Application filed December 30, 1910.

Patented Juneffi, 1911. Serial No. 600,156.

ed inthe face plate, and Fig. is a detail of the shaft locking latch.

The following is a detailed description of the drawings.

A is a window ed the upper is a metal box, one of which is secured in anaperture in the upper portion of each To all whom'it may concern:

Be it known that I, MATTHEW DOBSON, a citizen of the United States, andresiding in the city ofPittsburg, .in the county of Allegheny and Stateof Pennsylvania, have invented or discovered new and useful Improvementsin Sash-Suspension Devices, of which the following is a specification.

My invention consists in a new and imframe in which are mount- 10 provedwindow sash suspension device, ing through holes aa in the box .D andadapted for use as a substitute for the conengaging the material of saidframe. The ventional cord and suspended weight. box D is provided with aremovable cover Generally speaking, it consists of a sashpreferablyformed vertically in two plates 1 cord spool fixed upon a rotating shaftwhich and 1 which are of greater length than the is mounted, preferably,in a box or casing height of the box'D so that they may be secured inthe upper portion of the window fixed in place by means of screwspassing frame. A spiral spring is coiled about said through holes bb inthe ends of said plates shaft, one end of the spring being secured to-and engaging the material of frame A. said spool and the other endtothe box or In the box D are mounted a pair of sashsome other fixedpoint. The strength and cord spools 2 and 2 controlling, respectensionof the spring is regulated so that it tivcly, the upper sash B and thelower sash acts upon the spool to balance the weight of G. As thesespools are of identical conthe sash and prevent its accidental descentstruction but placed in reversed position, I from any adjusted position.will proceed to describe the upper spool 2.

Means are provided for preventing the The spool 2 is provided with apair of cirlongitudinal movement of the shaft when incumferentialflanges 3-3 and a bore of stalled and I prefer also to provide a pulleyvarying diameter 4-5. The smaller bore keyed to the outer end of theshaft whereby 5 is threaded, as shown. the Window may be convenientlyraised .or 6 is the spool shaft, having its ends jourlowered by means ofa belt or cord passing naled in holesof suitable size in the walls oversaid pulley and operatively connecting of box D. One end of shaft 6 isof reduced the same to a hand or power operated diameter and is threadedto engage the mechanism. threaded bore 5 of spool 2, while the re- Novelconstruction and arrangement of mainder of said shaft is of proper sizeto fit parts will appear from the following deloosely the largerdiameter 4. of said spool.

scription. The outer end of shaft 6 is provided with a In theaccompanying drawings, Figure 1 slot 7 so that a screw driver may beused is a perspective showing a window frame, to install the same. Toprevent longitudinal in which are mounted an upper sash and a vmovementof the shaft 6, I provide a latch lower shaft, provided with mysuspension 8 pivoted on the outer wall of box D and devices, the framebeing partially broken engaging a circumferential groove 9-in the awayto show one of the suspension devices; surface of shaft 6, thus holdingsaid shaft Fig. 2 is a front elevation of the box, pulleys in place butpermitting its free rotation. being provided on the outer ends of the 10is a' spiral spring mounted on shaft 6 spool shaftsyFig. 3 is a verticalsection of and having one of its ends secured in a the same along theline III-III in Fig. 5; hole in the bore of spool. 2, while the other-Fig. 4 is a.horizontal section of the same end is secured in a hole inthe wall of box along the line IV-IV' in Fig. 2; Fig. 5 is a Thestrength and tension of the spring side view of the box, looking in thedirecis regulated so that it counterbalances the tion of the arrow inFig. 2, the pulley being weight of the window sash. omitted; Fig. 6 is adetail of one of the spool 11 is the sash-cord, one end of which isshafts; Fig. 7 is a detail of one of the spools, secured in the usualmanner to the edge of and Fig. 8 is an end View of the same looksash Bwhile the other end. is led up over ing in the direction of the arrow inFig. 7; an anti-friction roller 12, mounted in face 5 ig. 9 is a-detailof one of the rollers mount-. plated, is wound about the spool 2 andse-;

side of the frame by means of screws passsash B'and the lower shaft C.

cured atits end thereto to prevent slipping. It is evident that thespring 10 counterbalances the sash so that the sash may be be raised orlowered by grasping the sash in the usual manner, as in churches orpubhe buildings, I find it convenient to raise or I lower the sash byrotating the shaft 6. For

this purpose I key or'otherwise secure a pulley 13 upon the outer end ofshaft 6, which pulley may be engaged by a cord or belt 14 operativelyconnected to a hand orpower operated mechanism, not'shown. In such casesI,-pr efer to provide some means for preventing the spool 2 fromunscrewing from shaft 6, such as a key 15 engaging said shaft and saidspool. The lower spool, 2, is mounted in a manner the reverse of that ofspool'2, so as to bring spool 2 in the proper horizontal position. Shaft6 latch plate 8 spring 10*,pulley 13 and cord 14 are similar to thecorresponding elements in the installation of spool 2. The sash-cord 11is attached to and Wound about the spool 2 led over a roller l2 mountedin face plate 1*, and is attached in the usual manner to the edge of thesash C.

In installing the box D in the frame, the plates. 1 and 1? are securedin place, as shown and the strip 16, which is secured to the frame andinterposed between the sash B and C, is carried up over the abuttingedges of said plates, concealing their juncture but not interfering withtheir re inoval when desired. When it is desired:to gainaccess to eitherspool, as for the 111- stallation of a new sash-cord or for any otherpurpose, the proper plate 1 or 1 may strong. In case the spring breaksor be comes weakened, the same may be replaced without difiiculty. Thebox D is practically dust proof and is much more inconspicuous than thedevices now in general use. I avoid the rattling and banging of theweights when the sash is raisedor lowered rapidly,.and the greatinconvenience of installing anew cord in the case of a break.

What I desire to claim is A sash suspension device composed of a box, ashaft rotatably mounted therein, a sash-cord spool fixed on said shaft,a spiral spring coiled about said shaft, one end of said spring beingsecured to said spool and the other end thereof being secured tosaidbox, a removable cover for said box, and a cord roller mounted in saidcover.

Signed at Pit-tsburg, Pa, this 24th day of December 1910.

. MATTHEW DOBSON. Witnesses E A. W. FoRsY'rH, EDW'ARD A. LAWRENCE.

Copies of-this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. e.

